A retrospective analysis of usefulness of impulse oscillometry system in the treatment of asthma

Respiratory Research

Table 3 Comparison between the impulse oscillometry system and spirometry in terms of subtypes at baseline (pre) and after treatment (post)

		All	Subtypes			P	Post-hoc test
		All	CP	PP	R	P	CP-PP	CP-R	PP-R
FeNO (ppm)
	Pre	70.6	54.9	72.4	93.1	NS
	Post	28.8	27.4	26.7	31.9	NS
		**	*	**	**
Impulse oscillometry
R5 (kPa/L/s)	Pre	0.46	0.44	0.53	0.25	**	**	**	**
	Post	0.31	0.33	0.33	0.22	**	NS	**	**
		**	**	**	NS
R20	Pre	0.31	0.37	0.30	0.22	**	**	**	**
	Post	0.26	0.30	0.25	0.19	**	**	**	**
		**	**	**	NS
R5-R20	Pre	0.15	0.07	0.23	0.03	**	**	NS	**
	Post	0.06	0.04	0.08	0.02	**	**	NS	**
		**	NS	**	NS
X5	Pre	−0.24	−0.16	−0.33	−0.12	**	**	NS	**
	Post	−0.12	−0.12	−0.13	−0.09	*	NS	NS	*
		**	**	**	**
Fres	Pre	19.8	15.7	24.0	14.0	**	**	NS	**
	Post	14.2	12.2	15.9	11.4	**	*	NS	**
		**	**	**	*
AX	Pre	1.84	0.81	2.91	0.39	**	**	NS	**
	Post	0.54	0.38	0.69	0.24	**	*	NS	**
		**	**	**	*
Spirometric values
%FVC	Pre	80.9	82.6	77.0	91.0	*	NS	NS	**
	Post	99.0	97.8	99.2	100.4	NS
		**	**	**	*
%FEV1	Pre	67.5	72.4	61.4	77.9	**	*	NS	**
	Post	92.7	94.2	91.2	95.2	NS
		**	**	**	**
FEV1/FVC ratio	Pre	69.6	75.1	65.2	72.8	**	**	NS	*
	Post	78.9	81.9	77.0	80.3	*	*	NS	NS
		**	**	**	**
%MMEF	Pre	34.0	43.8	26.1	41.3	**	**	NS	**
	Post	61.0	67.9	55.5	68.2	*	NS	NS	NS
		**	**	**	**
%PEF	Pre	73.1	74.2	66.4	95.3	**	NS	**	**
	Post	103.9	100.9	102.4	115.3	*	NS	*	**
		**	**	**	**

Data were presented as mean (standard error of mean) or number (percentage). The differences among the subtypes were evaluated using non-repeated analysis of variance (†P) with the Student–Newman–Keuls test. *: p < 0.05, **: p < 0.01 and NS: not significant. CP-PP: between the central predominant type and peripheral predominant type; CP-R: between the central predominant type and resistless type; and PP-R: between the peripheral predominant type and resistless type

ISSN: 1465-993X